Pulverizer



I Re. 21,523

Aug. 6, 1940. c. 1-. ELDERKIN PULVBRIZER Original F11! Jun. 28, 193'! INVENTOR. 6 1.170! 77 E4. DlRK/N.

{My d1? ATTORNEYS.

Reislued Aug. 6,

PULVERIZER Clair T. Elderlrin, Zamora, Calif., assignor, by mesne assignments, to Miller Manufacturing Company, a corporation of California Original No. 2,128,727, dated August 30, 1938, Se-

rial No. 150,735, June 28, 1937.

Application for reissue October 23, 1989, Serial No. 302,265

9 Claims.

The present inventionrelates to improvements more eiilcient in operation and is simplified inconstruction.

More particularly it is proposed to provide for 'a better control of the air currents passing through the mill whereby a more generous amount of air is made to circulate through the mill and eddy currents are by-passed and made to jointhe main current .so that all dead air pockets are avoided.

It is further proposed to arrange the rotor or beater in the machine in such a manner that the material under treatment is evenly distributed ,through the. housing. I

It is further proposed in the present invention to provide means on the rotor for dragging hay from the entrance into the housing whereby the' feeding of the hay is improved, particularly where the hay is fed in the form of bales, or shows a tendency to bunch at the entrance to the hous- It is a further object of my invention to pro vide improved mounting means for the rotor whereby the weight is balanced to better ad-' vantage than in existing mills.

And finally it is proposed to provide certain improvements in construction whereby the mill is simplified and more easily assembled.

Further objects and advantages of my invention will appear as the specification proceeds.

The preferred form of my inventionis illustrated in the accompanying drawing in which: Figure'l shows a vertical transverse section through my mill; Figure 2, an axial section taken-along line 2'- of Figure l, and a Figure 3, a detail view of a beater and as- Q sociated parts as seen from line 3-3 of Figure 1.

While I have shown only the preferred form of my invention, I wish, to have it understood that various changes or modifications may be madewithin the scope of the claims hereto attached without departing from the spirit of the invention.

Particularly I wish to have it understood that the features of my invention are not confined to an alfalfa mill but may be used in connection with any material having similar characteristics.

Referring to the drawing in detail, my mill l 5 may be supported on any suitable base 2 which is here illustrated as composing four angle irons 3 arranged in rectangular relation and joined by a plate 4. The mill comprises a housing 5 and a rotor 6 confined in the same.

The housing is made of twoend plates I and 8 rising vertically from the base in spaced and parallel relation and. being secured thereto by means of flanges 9 and III. The plates are of identical form and each comprises a rectangular 16 body section II and a tapered top section If.

Between the plates is supported the shell of the housing comprising a semi-cylindrical section l3, vertical sections l4 and I5 rising-from the upper edges of the semi-cylindrical section and in- 8) clined sections 15' and I1 tapering toward one another and terminating in a restricted outlet 16', which latter-"connects, through a conduit It, with a cyclone collector not shown.

In manufacturing .my pulverizer; I preferably ll make the semi-cylindrical section ii, the vertical sections l4 and I5 andthe inclined sections l6 and H in one piece, referred to as shell i8, and the latter is clamped between the rear plate 8 and the front plate 1 by a series of bolts 20 surround- I0 ing the shell as shown in the drawing.

In the housing is supported a screen or perforated plate 23 which is semi-cylindrical in form and is secured to the vertical shell sections I4 and iiby means of bolts 21 in such a manner as that it complements the lower semi-cylirrlrical section to form a complete cylinder.

The rear plate 8 .is preferably made with a removable middle section 8 for facilitating the insertion and removal. of the screen. 7

- It will be noted that the inclined shell sections l6 and I1 are spaced from the screensufiiciently toform pockets II and 25 respectively, and in order to control and provide an outlet for eddy currents that may form in these pockets, I provide two bafllesli and 21 which run parallel to the inclined shell sections iG-and l1 and the walls of the outlet it so as, to form by-passes 28 and 20. The bailles are welded to the front plate I and contact the rear plate 8.

Inside of the cylinder I provide the rotor or beater mounted on the shaft 30. 'The rotor comprises a fiat plate It, mounted so as to be closer to the rear plate 8 than to the front plate I, as shown in Figure 2, and having a plurality of I.

armsprojectingtherefrom. hcharmcarrlesat ltseztremityab'eaterplateawhichexiends' transverselythrough the cylinder substantially fromthefrontplatetotherearplateandis -ssllghtlyinclinedtotheaxlsofrotatiomasshown inFlgure3,so astobaveatendencytofeedthe material in the cylinder toward the, rear plate during its rotation.

The front plate has a large entrance opening it which connects with trough II which latter is preferablylnclinedtofeedhayintothemillby gravity. Inorder to facilitate the feeding, particularly of baled hay, I provide a number of prongs "on therotonthepmngsbeing arranged oppositetheopeningsoastotearlnto thehay projecting through the opening and to drag the hay into the mill. The prongs are preferably arranged at difi'erent distances from the axis of rotation so that they attack the hay at different .points.

They are grouped around the axis of rotation substantially within the confines of the opening and the opening is arranged substantially centrally with respect to the drum so that all the prongs are active on a bale ofhay or.block of other material corresponding substantially .to th size of the opening at the same time.

The prongs are shown in the form of rounded pins and present blunt or rounded front faces in the direction of rotation, so'that when they rip into the material, they have no tendency to cut through the same, but rather tear it loose and whirl it toward the wall of the drum.

ject from the face of the rotor toward the intake opening througha considerable distance so as to extend beyond. the outline of the face of the rotor which is here shown as being substantially flat. It'is apparent that it the prongs'were very short or did not project beyond the outline of the rotor, or a projecting bub structure or other obstacle, they would be eitherineifective or their inefiectivenes would be lessened considerably, depending upon the nature of the material fed and the 8? degree to which such obstacle'would prevent en- Q themill. 'l'hebeater'sthenactontbebaleofhay topulveriaeit. Atthe'sametime'adraft of air is setup, the air comingin thromhtheopening I4 and through the screen, which latteris ofrelatively'thinniaterlaland holds backportionsof-thehaywhich have-not 'i'henormaltendency'oi'theair,whichcarrles thepulverlaedmaterialalongwith-itistodis- 'chargeintangentialdirection. flincethe'rotor '1! rotatesclockwise (seel'lgurelLiheladen airwill first dischargeintothe pocket and the by-pas 28 which liespraethaliyinthe nor -malpathqtairdischargedbycentrliugalforce.

' AfurtherportionofthealrwilLofcqllrsadlk' It will further be noticed that the prongs prosroas i conduit, am is into the hood formed by the bafiies 2,0 and I'l.

The major part of this air will also move upward. A remaining portion of air, finally will reach the pocket 2!, but instead of returning into the mill, will be drawn upward into the by-pass It on account of suction created by the air forced through the conduit ll. Thus air may be discharged through practically the entire screen area to-insure'a free fiow and with such a large exhaust area available, the intake may be increased correspondingly, as compared with mills now on the market.

The angular position of the heaters serves to better distribute the material throughout the mill.

Where straight blades are used I find that usually only the front portion of the mill renders effective service, while the rear section, adjacent the .wall I, carries but little material. With my inclined blades a considerable portion of the material is crowded toward the back wall and the capacity of the mill is increased accordingly.

1. In a'pulveriser for alfalfa hay or the like, a housing having parallel end walls, a semi-cylin-' di'ical bottom section, vertical sides rising from the edges of the bottom section and inclined sections rising from the vertical sections and tapering to a restricted outlet. a semi-cylindrical screen arranged in the housing complementary to the bottom section and forming pockets with the side sections and means for by-passing edibcurrents formed in the pockets into the outlet.

' 2. In a pulverizer, a housing having end'walls, a semi-cylindrical bottom section, vertical side sections rising fromthe bottom section, and inclined sections rising from the vertical sections and tapering to a restricted outlet; a semicylindrical screen extending between the end walls with its concaveface' presented downwardly in complementary relation with the bottomsection and coacting with the latter to define a cylindrical.

reducing chamberfthe screen forming pockets with the side sections, means for introducing material into the reducing chamber; a rotor in the reducing chamber having beaters thereon,

andapairoibaillesmountedinsubstantially.

parallelrelation with the inclined housing sections and coacting therewith to provide by-passes leading directly from the pockets to the housing outlet, the baflies being spaced from each other to defines main outlet therebetween.

3. In a pulveriaer, a housing having end walls,

a semi-cylindrical bottom section, vertical side sections rising. from the bottom section, and inclined rising from the vertical sections and tapering to a restricted outlet, a'semi-cylin- .drical'screen extending between the v with its concave-face presented downwardly in complementary relation with the bottom section andcoactingwiththelattertodefineacylindrl calreducing chamber, the screen forming pock.- 7 ets. with the side sections, means for introducing material into the reducing chamber,.a rotor in the reducing chamber having heaters thereon,-

andapairofbamesmountedinsubstantlallyparalleljrelation with the inclined housing sections and coacting therewith to provide ivy-pales leadingdiiectly n'mnme pockets totlie housing outlet, the bailles being spaced from each other to define a 'main'outlet therebetweat, the main outlet having a greater cross-sectional area than either by-pas's.

4. Inapulves'laenahousinghavingend asemi-cyiindricalbottomsectimvertic'alskb ducing material into the reducing chamber, a

rotor in the reducing chamber having beaters thereon, and a pair of baliies,mounted in substantially parallel relation with the inclined housing sections and coacting therewith to provide by-passes leading directly from the pockets to the housing outlet, the bailles being spaced from each other to define a main outlet therebetween, the lower ends of the bellies being disposed below the top of the screen and spaced substantially midway between the screen and the.

adjacent inclined housing sections.

5. In a pulverizer; a housing having-end walls, a semi-cylindrical bottom section, vertical side sections risingfrom the bottom section, and inclined sections rising from the vertical sections and tapering to a restricted outlet; a semi-cylindrical screen extending between the end walls' with its concave face presented downwardly in complementary relation with the bottom section and coacting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing rn'aterial into the reducing chamber; a rotor in the reducing chamber having heaters thereon; and a pair of baflles mounted in substantially parallel relation with the inclined housing sections and directly from the pockets to the housing outlet; the ballles being spaced from each other to define a main outlet therebetween, the housing and baflles being symmetrically disposed on opposite sides of a vertical central plane passing through the axis of rotation of the rotor.

6. In a pulverizer; a housing having end walls, a semi-cylindrical bottom section, vertical side sections rising from the bottom-section, and inclined sections rising from the vertical sections and tapering to a restricted outlet; a semi-cylindrical screen extending between the end walls with its concave face presented downwardly in complementary relation with the bottom section and coacting with the latter to define a cylindrical reducing chamber; the screen forming pockets with the side sections; means for introducing material into the reducing chamber; a rotor in the reducing chamber having heaters thereon; and apair of bames moimted in substantially parallel relation with theinclined housing sections and coacting therewith to provide byleading directly from the pockets to the housing outlet; the bailles being spaced from each other to define a main outlet therebetween; one end wall having a removable section extending above and screen.

below the screen to allow lateral removal of the 7. In a pulverizer, a cylindrical housing peripheral perforations and'a central axial intake, a rotor in the housing having a receiving face opposite the intake and substantially coextensive therewith; an inclined trough leading to the intake and being adapted to feed abale'of hay or the likeby gravity upon the face of the rotor,

I the entire front surface area of the bale of hay is simultaneously torn into by the prongs for ripping bunches of hay therefrom and for throwing the bunches outwardly for substantiallv uniform distribution. through the housing, and fixed transverseblades at the outer end of the rotor and in close. proximity to the periphery of the housing for drawing the separated bunches outwardly and for whirling them against the walls of" the perforations whereby the hay is comminuted and discharged through the perforations in the form of relatively fine particles.

8. In a pulverizer, a cylindrical housing having peripheral perforations and a central axial intake, a rotor in the housing having a receiving face opposite the intake and substantially co-extensive therewith, a trough leading to the intake and being adapted to guide a bale of hay or the like upon the face of the rotor, individual ripping p'rongs'projecting from the face of the rotor toward the intake, the prongs being evenly dis- 'tributed around the axis of rotation and being h an area substantially co-extensivef with that of coacting therewith to provide byleading the intake opening whereby the entire front surface area or the bale of hay'is simultaneously turn into by the prongs for ripping bunches of hay therefrom and for throwing the bunches outwardly for substantially uniform distribution through ,the housing, and transverse blades at the outer ends of the rotor and in close proximity to the periphery of the housing for drawing the separated bunches outward and for whirling them against the walls of the perforations whereby the hay is comminuted and discharged through the ing to the intake and being adapted to feed a bale of hay' or the like upon the'face ofthe rotor, individual ripping prongs projecting fromthe face of the rotor toward the intake, the prongs being evenly distributed around the'axis of rotation and being disposed at different radial distances therefrom to describe concentric paths when the rotor rotates, the radial spacing of the prongs being such as to cause the concentric paths to evenly cover an area substantially coextensive with that of the intake opening whereby the entire front surface area of the bale of hay is simultaneously torn into by the prongs for ripping bunches of hay therefrom and for throwing the bimches outwardly for substantially uniform distribution through the housing and means on the rotor beyond the margin of the intake for comminutlng the bunches of hay.

, cum. '1'. mm. 

